A Cryptographic Key Generation Using 2D Graphics pixel Shuffling

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85 International Journal for Modern Trends in Science and Technology

Volume: 2 | Issue: 05 | May 2016 | ISSN: 2455-3778IJMTST

A Cryptographic Key Generation Using2D Graphics pixel Shuffling

Londhe Swapnali

| Jagtap Megha

2

| Shinde Ranjeet

3

| Belsare

4

1Department of Computer Engineering, S.B Patil College, Indapur, India2Department of Computer Engineering, S.B Patil College, Indapur, India3Department of Computer Engineering, S.B Patil College, Indapur, India4Department of Computer Engineering, S.B Patil College, Indapur, India

Now a day with incredible change in social media network like mobile communication and computer, all

type of a data such as audio, video, images are used for the communication .Privacy for that data is an

important issue .Cryptography is one of the technique used for stopping unauthorized access and increasingintegrity of that data. In research area encryption and decryption scheme is used based on image pixel

shuffling and transposition. For security purpose we can use cipher algorithm for generating key using RGB

values of the pixel instead of using only pixel values. For that purpose in our proposed system we are using

m*n size image on which different operations can be performed. Our proposed system is more secure as

compare to existing system.

KEYWORDS: Cryptography, Encryption, Decryption, Cipher text, Pixel, 2D graphics image, Integrity, keyNetwork.

Copyright © 2015 International Journal for Modern Trends in Science and Technology All rights reserved.

I. INTRODUCTION

We cannot think about the world without

communication .Now a day’s hiding of data from

unauthorized person is an important task .There

are many online services present in which

communication takes place through social media

network. In that case there is high probability of

hacking [1].Integrity of a data is not maintained

well.

Different techniques are used to maintain asecurity in all social networks communication. The

techniques such as cryptography and stenography.

Cryptography is the best technique to increase the

security between communications. It’s applied on a

different type of data such as text, image, video etc.

In cryptography two different processes are there,

first is encryption in which specific key is used to

encrypt the data. It is a process of converting plain

text in to cipher text and second is decryption in

which cipher text is converting into plain text. Two

things are important for performing encryption anddecryption, first is algorithm and second is key.

Plain text is combined with the algorithm to form a

key. This generated key is then used for the

encryption process .This cipher text is applied to

the algorithm for generating the plain text.

Symmetric and asymmetric are the two approaches

of encryption .In symmetric same cryptographic

key is used for encryption and decryption but in

decryption different key’s are used for processing.

In this approach keys are identical or combination

of different keys.

Image is made up of different color pixels. Every

pixel having different colors at a single point, sopixel is a single color dot. Digital approximation

can be resulted from that color dot using this

values reconstruction of that image take place.

Digital image having two types first is color image

made up of color pixels. Color pixel holds primary

colors such as red, blue and green. This values

proportion used for creating secondary colors. If

each primary contain the 256 levels then four byte

memory required for each. Bi-level image having

single bit to represent each pixel. It’s having only

two states with color black and white [2].In this paper we focused on key part. In image

based cryptographic technique, cipher algorithm of

ABSTRACT


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A Cryptographic Key Generation Using 2D Graphics pixel Shuffling

m*n size image used for fetching RGB pixel values.

Encryption and decryption of an m*n size image is

based on the RGB pixel values. Property of 2D

graphics image is only viewing and listing image

dimensions is sometimes impossible for generating

the image.

Rest of the paper is organized as, 2nd section is

related to related work. 3rd section givesinformation related to proposed system, 4th section

represent the advantages, 5th section proposes

experimental work with some mathematical

part.6th section provides the overall summary of

our paper with conclusion of the paper.

II. PROPOSED SYSTEM

In previous existing system key generation is

take place using the pixel values of the 2D graphics

image. In which proposed algorithm used for

extracting the pixel values as well as creating the

key from pixel [1]. For increasing the security of

image during the communication and

transmission we propose new techniques. In last

module we use RSA algorithm for encryption and

same key is used for decryption process of 2D

graphics image [2].

In this paper user having freedom to generate

any type of pattern signature etc. having fixed size

of design pattern .Any image is made up of using

different colors pixels. Each pixel having three

components ass RGB . This RGB values first of all

extracted and after shuffling we get cipher image.

It’s done only by using a RGB values[2].

In this method we not use the bit values of pixel

as well as pixel expansion at the end of the

encryption and decryption process. Pixel having

numeric values which interchanged or the RGB

values displaced from their original position to

create a cipher text. When we add all values in

between image no change take place in original size

and shape in image. All the features of an image

remain unchanged during the process of

encryption and decryption [2].

Figure.1 describes the architecture of encryption

and decryption. We provides user interface for

designing the pattern .According to cipher

algorithm we fetch the all RGB values and

manipulation take place using reshuffling

,transposition techniques for generating key.

Image decomposed into three components which

act upon the cipher algorithm. That components

form the all features and characteristics of original

image. Within image boundaries all the RGB values

are shuffled and interchanged, created array is

different for all components.

Figure 1:- Encryption and decryption of image

III. FLOW OF PROJECT

Figure.2 describes the flow of encryption and

decryption process. In which first of all we accept

the image, fetch all the RGB components using

cipher algorithm and convert plain text in to cipher

text. We use RSA algorithm for the encryption

process. In which key is combined with cipher text

for performing encryption process. Decryption

process take place by importing all data and using

reveres process of encryption. This process is done

for generating original image with its shape and

size.

Figure 2: The flow chart diagram for the encryption and

decryption process.


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Volume: 2 | Issue: 05 | May 2016 | ISSN: 2455-3778IJMTST

IV. PROPOSED ALGORITHM

1.

Read the user created Graphical image.

2. Read the pixels and shuffle among them

there position (i.e. exchange the 1st pixel

value with the last position pixel value, 2nd

pixel value with the second last position

pixel value and soon until we reached to the

centre pixel value).

3. Create a group of pixels (i.e. 64 bits).

4. Shuffle the groups among their position (i.e.

exchange the 1st position group with the

last position group, 2nd position group with

the second last position group and soon

until we reached to the center position).

5. Initiate i=1

6.

Declare array to store key in array Result

[16].

7. Declare two variables var1 and var2.

8.

Store the 1st group value in var1 and 2nd

group value in var2.

9. While i < size of array

a. Perform the XOR operation between var1

and var2.

b. Store the result of XOR operation in ith

block of array.

c. Store the value of result obtained in var1

and next group value into var2.

d. Increment the value of variable i and go to

step

10.

Results obtained from Step9 are applied in

each phase of DES algorithm as

independent sub-keys.

V. RESULTS AND DISCUSSION

In the fig 3, it shows the key generation using

given input image. Input we can fetch from

anywhere after that using DES algorithm we

generate a key.

Fig. 3 Key generation Process

Fig. 4 Encrypted text insertion and mail sending

In the fig 4, which text we have to encrypt its

inserted .In initial stage we insert only 16

characters for encryption purpose. After that

cipher text and generated key sended on receiver

mail for decryption purpose for getting original

text.

VI. CONCLUSION

In this paper we have proposed cryptographic

key generation on a 2D graphics using RGB pixelshuffling & transposition. For our proposed system

we use any size of image as an input. Small change

in image creates a number of keys. In proposed

system at each stage cipher algorithm generates

different keys using the RGB pixel values on which

different operations are performed. Existing system

uses pixel values only but our proposed system

extracts RGB pixel values of given image. This will

be helpful for increasing security of given 2D

graphics image. In future we can combines

different RGB values of pixel with each other andgenerate a new pattern for key.

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[2]

Xiukum Li, Xianggian Wu*, Ning Qi,KuanquanWang. A novel cryptographic Algorithm

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A Cryptographic Key Generation Using 2D Graphics pixel Shuffling

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A Cryptographic Key Generation Using 2D Graphics pixel Shuffling